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In information technology, header refers to supplemental data placed at the beginning of a block of data being stored or transmitted. In data transmission, the data following the header is sometimes called the payload or body.

A header is a part of a document or data packet that carries metadata or other information necessary for processing the main data. It is a widely used term in information technology that refers to any supplemental data that are placed before the actual data.

A header is text that is placed at the top of a page, while a footer is placed at the bottom, or foot, of a page. Typically these areas are used for inserting document information, such as the name of the document, the chapter heading, page numbers, creation date and the like.

Headers are used to create openings for windows, doors, and interior passageways. They serve a significant structural purpose. Since windows and doors cannot support weight other than their own, the weight of above these opening must be collected and redistributed to adjacent studs.

A header record is the first record of the exported data set or data queue. It describes the characteristics of the object. A header record contains the information described in this table.

Header data is valid for the entire document like the customer/sold to party number,PO number, PO date and the net value etc. While Item data is particular to the line items in the order.

The header contains information about the record, such as: record type, record subtype (if the record includes subtypes), record length, and the time and date the record was written to the data set or log stream.

In information technology, header refers to supplemental data placed at the beginning of a block of data being stored or transmitted. In data transmission, the data following the header is sometimes called the payload or body.

A header is the information that appears at the top of each printed page and a footer is the information that appears at the bottom of each printed page. By default, new workbooks do not have headers or footers.

A table header is a row at the top of a table used to label each column. For example, in the below table there are three columns with a "Name," "Date of Birth," and "Phone" header. Example of a table header in HTML. Header row in a Microsoft Excel table.